Display Device and Operating Method of the Same

2. The display device of claim 1, wherein the processor is further configured to execute the one or more instructions to change the requested resolution, based on an input to switch to a wide screen mode.

3. The display device of claim 1, wherein a first aspect ratio of the first resolution and a second aspect ratio of the second resolution are different from each other.

4. The display device of claim 1, wherein the processor is further configured to execute the one or more instructions to compare the first image and the second image with each other to determine whether an error occurs in the second image.

5. The display device of claim 4, wherein the processor is further configured to execute the one or more instructions to determine that an error occurs in the second image based on image data included in the first image not being included in the second image.

6. The display device of claim 4, wherein the processor is further configured to execute the one or more instructions to: compare a first aspect ratio of the first image with a second aspect ratio of a region of the second image corresponding to the first image, and determine that an error occurs in the second image based on the first aspect ratio and the second aspect ratio not matching within a specified range.

8. The display device of claim 1, wherein the processor is further configured to execute the one or more instructions to control the inputter/outputter to transmit information about the requested resolution to the content providing device through extended display identification (EDID) information.

9. The display device of claim 1, wherein the processor is further configured to execute the one or more instructions to control the display to display an image at the first resolution based on an error occurring in the second image.

10. The display device of claim 1, wherein the processor is further configured to execute the one or more instructions to control the display to output a message notifying about occurrence of an error based on the error occurring in the second image.

12. The method of claim 11, wherein the changing of the requested resolution of the display from the first resolution to the second resolution comprises changing the requested resolution, based on an input to switch to a wide screen mode.

13. The method of claim 11, wherein a first aspect ratio of the first resolution and a second aspect ratio of the second resolution are different from each other.

14. The method of claim 11, wherein the determining of whether an error occurs in the displayed second image comprises comparing the first image and the second image with each other to determine whether an error occurs in the second image.

15. A non-transitory computer-readable recording medium having stored thereon a program for performing the method of claim 11.